The gyrotron travelling wave tube (gyro-TWT) is an ideal high-power, broadband vacuum electron amplifier in millimeter and sub-millimeter bands. It can be applied as the source of imaging radar to improve resolution operating range. To satisfy requirements W-band high-resolution radar, design experimentation TE02 mode gyro-TWT were carried out. In this paper, designs key components are introduc...

Considering a Hamiltonian Dynamical System describing the motion of charged particle in a Tokamak or a Stellarator, we build a change of coordinates to reduce its dimension. This change of coordinates is in fact an intricate succession of mappings that are built using Hyperbolic Partial Differential Equations, Differential Geometry, Hamiltonian Dynamical System Theory and Symplectic Geometry, L...

Transport at the pedestal top is important for the inter-ELM pedestal dynamics. Linear gyrokinetic analysis of the pedestal during an ELM cycle on MAST has shown kinetic ballooning modes to be unstable at the knee of the pressure profile and in the steep pedestal region whilst microtearing modes (MTMs) and electron temperature gradient modes (ETGs) dominate in the shallow gradient region inboar...

We report the first experimental verification of a gyrotwistron amplifier. The device utilized a single 9.858 0Hz, TED&z cavity, a heavily attenuated drift tube, and a long tapered output waveguide section. With a 440 kV, 200 — 245 A, 1 ps electron beam and a sharply tapered axial magnetic field, peak powers above 21 MW were achieved with a gain near 24 dB. Performance was limited by competitio...

Mining and tunelling projects frequently involve the construction of long tunnels whose azimuths are to be determined very accurately, particularly prior to holing. Although conventional traverse methods may be employed, generally, these cannot guarantee the accuracy required and contractual conditions may then specify that independent gyrotheodolite bearings must be obtained. To this end, and ...

Plasmas that are strongly magnetized in the sense gyrofrequency exceeds plasma frequency exhibit novel transport properties not well understood. As a representative example, we compute friction force acting on massive test charge moving through coupled and one-component using generalized Boltzmann kinetic theory. Recent works studying weakly regime have shown strong magnetization leads to trans...

The paper reports an analytical model of a 4-DOF gyroaccelerometer consisting of 2-DOF drive and 2-DOF sense oscillators configured orthogonally. A detection scheme for time varying angular rate and linear acceleration, by combining the structural-model of gyro-accelerometer with the processes of synchronous demodulation and filtration, which leads to the inphase and quadrature components of th...

This paper presents driving and balancing control of a single-wheel mobile robot system called the name of GYROBO. GYROBO utilizes a gyro effect to stabilize itself. Three actuators are used to perform driving and balancing tasks. After modification of hardware and relocation of materials inside the wheel housing of the previous GYROBO model, performances of trajectory following control as well...

Some problems on guidance and robust gyromoment attitude control of agile spacecraft for remote sensing the Earth surface are considered. Elaborated methods for dynamic research of the spacecraft programmed angular motion at principle modes under external and parametric disturbances, partial discrete measurement of the state and digital control of the gyro moment cluster by the few-excessive gy...

In the Humanoid Leagues balancing during walking and running is still the biggest challenge for most of the teams. We present here some work in which a dynamic walker is stabilised by using a fast heavy rotor, a gyro. The dynamics of a symmetric, fast rotating gyro is different from that of a non-rotating solid body, e.g. in the case of small disturbances it tends to keep the axes the same. Res...